app tile fixups (bug 1058518) (bug 1058520)

This is based off the earlier work with most of ngoke's earlier review comments addressed. The grid will be its own component at some point also but it will have to be its own PR. Most of the visual fixes are that tiles now have better internal alignment.

Mobile detail:

![](http://f.cl.ly/items/3x0r0X3T011t2Z0i2y2G/Image%202014-10-03%20at%201.05.53%20PM.png)

Desktop detail:

![](http://f.cl.ly/items/1h0m1u133a2v3C0A3c39/Image%202014-10-03%20at%201.06.54%20PM.png)

Desktop search: 

![](http://f.cl.ly/items/393y0z112W3c3s3B190n/Image%202014-10-03%20at%201.08.00%20PM.png)

Mobile search:

![](http://f.cl.ly/items/3c080u1T3p1u2g0d251L/Image%202014-10-03%20at%201.09.05%20PM.png)